Moving slowly; sluggishly — a mimetic adverb describing heavy, plodding, or lethargic movement.
猫はのそのそと庭を歩いていた。
The cat was plodding slowly around the garden.
まだ眠いのか、彼はのそのそ支度していた。
Maybe still sleepy, he was sluggishly getting ready.
昼下がり、町はのそのそと静かだった。
In the early afternoon, the town was quietly sluggish.